Patent US4291739A successfully refreshed from Google Patents.
US4291739A
Expired / Lapsed
US
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Method of manufacturing a hollow casting mold
Assignee: Individual
•
Filing: 1979-08-16
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Granted: 1981-09-29
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Expires: 1999-08-16
Abstract
Abstract A method of manufacturing a casting mold includes the steps of forming a casting mold body of a flowable binder-free backfilling material, stabilizing the casting mold body by negative pressure, and providing in the body a lost form of synthetic plastic material, particularly foamed synthetic plastic material.
Inventors
- 👤 Eduard Baur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:31
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/14; B22C; B22C9/00; B22C9/02; B22C9/03; B22C9/04; B22C9/046
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A method of manufacturing of a casting mold, comprising the steps of forming a casting mold body of a flowable binder-free backfilling mass; stabilizing the casting mold body by negative pressure; providing in said body a lost form of synthetic plastic material; withdrawing a portion of the binder-free backfilling mass, after pouring of molten metal and during beginning of hardening of the cast part.
Claim 2
Independent Claim
64 words
A method of manufacturing of a casting mold, comprising the steps of forming a casting mold body of a flowable binder-free backfilling mass; stabilizing the casting mold body by negative pressure; providing in said body a lost form of synthetic plastic material; withdrawing a portion of the binder-free backfilling mass, after pouring of molten metal and during beginning of hardening of the cast part.
Claim 3
Dependent Claim
15 words
A method as defined in claim 1, wherein said withdrawing step is performed by aspiration.
Claim 4
Dependent Claim
36 words
A method as defined in claim 1, wherein said withdrawing step includes supplying of the binder-free mass withdrawn in heated state from the heated mold, to a further such mold with a further such lost form.
Claim 5
Dependent Claim
38 words
A lost form for a casting mold of a negative-pressure stabilized flowable binder-free backfilling mass, comprising plate elements of synthetic plastic material having faces which face toward one another; and an intermediate web-like element provided on said faces.
Claim 6
Dependent Claim
38 words
A lost form for a casting mold of a negative-pressure stabilized flowable binder-free backfilling mass, comprising plate elements of synthetic plastic material having faces which face toward one another; and an intermediate web-like element provided on said faces.
Claim 7
Dependent Claim
19 words
A lost form as defined in claim 4, wherein said plate elements are constituted of foamed synthetic plastic material.
Claim 8
Dependent Claim
15 words
A lost form as defined in claim 4, wherein said intermediate element is a fabric.
Claim 9
Dependent Claim
16 words
A lost form as defined in claim 4, wherein said intermediate element is formed by fibers.
Claim 10
Dependent Claim
16 words
A lost form as defined in claim 4, wherein said intermediate element is formed by carbon.
Claim 11
Dependent Claim
17 words
A lost form as defined in claim 4, wherein said intermediate element is formed by mineral filaments.
Claim 12
Dependent Claim
17 words
A lost form as defined in claim 4, wherein said intermediate element is formed by metallic fibers.
Claim 13
Dependent Claim
17 words
A lost form as defined in claim 4, wherein said intermediate element is formed by metallic wires.
Claim 14
Independent Claim
89 words
A method of manufacturing a casting mold, comprising the steps of forming a casting mold body of a flowable binder-free backfilling mass; stabilizing the casting mold body by negative pressure; providing in said body a lost form of synthetic plastic material by arranging plates of synthetic plastic material adjacent to one another and having faces facing towards one another and provided with an intermediate web-like element; and heating the backfilling mass before pouring a molten metal in the lost form by incorporating heating elements in the binder-free backfilling mass.
Claim 15
Independent Claim
89 words
A method of manufacturing a casting mold, comprising the steps of forming a casting mold body of a flowable binder-free backfilling mass; stabilizing the casting mold body by negative pressure; providing in said body a lost form of synthetic plastic material by arranging plates of synthetic plastic material adjacent to one another and having faces facing towards one another and provided with an intermediate web-like element; and heating the backfilling mass before pouring a molten metal in the lost form by incorporating heating elements in the binder-free backfilling mass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |